9-10 Clastic Dep Environ I

9-10 Clastic Dep Environ I - Clastic Depositional...

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http://pubs.usgs.gov/fs/2004/3121/images/river.jpg Clastic Depositional Environments I • Environments & SP Log Shape • Braided Streams • Meandering Streams • Crevasse Splays • Deltas
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SP Log Shape Shape of Lower Sand Contact Wilson & Nanz, 1959, Sand Conditions as Indicated by the Self-Potential Log , Shell EPR Memorandum Report 51, Fig 1 Gradational
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SP Log Shape Wilson & Nanz, 1959, Sand Conditions as Indicated by the Self-Potential Log , Shell EPR Memorandum Report 51, Fig 2, Fig 3 Simplified Descriptive Classification by Shape Smooth or Serrate Bell Cylinder Funnel
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SP Log Shape: River Point Bars and Channels Wilson & Nanz, 1959, Sand Conditions as Indicated by the Self-Potential Log , Shell EPR Memorandum Report 51, Fig .6
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Braided Streams Form sheet-like deposits of sand and gravel Channels look “braided” Multiple stream channels extend across valley floor Caused by flood events in nearby mountains Reservoir bounded above and below by unconformities http://resweb.llu.edu/rford/courses/ESSC500/Fuvial_slides/Rakaia1.jpg
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Braided Stream Bars http://www.geologyclass.org/igneous_rock_lecture121_fles/image002.jpg © Marli Miller http://tvl1.geo.uc.edu/ice/Image/propro/L621-6.jpg Upstream portion of the bar tails from larger rocks to finer sediments downstream. • Lower parts of the bar are light grey due to silt left by falling water level.
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Braided Streams Coarse gravel bar over fine silt from abandoned channel http://www.schursastrophotography.com/paleo/
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9-10 Clastic Dep Environ I - Clastic Depositional...

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